BICEP2 implications for single-field slow-roll inflation revisited

Antusch, Stefan and Nolde, David. (2014) BICEP2 implications for single-field slow-roll inflation revisited. Journal of Cosmology and Astroparticle Physics (JCAP), 1405. 035.

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Official URL: http://edoc.unibas.ch/39802/

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It is generally believed that in single-field slow-roll inflation, a large tensor-to-scalar ratio r>0.1 requires inflaton field values close to or above the Planck scale. Recently, it has been claimed that r>0.15 can be achieved with much smaller inflaton field values Δϕ<MPl/10. We show that in single-field slow-roll inflation, it is impossible to reconcile r>0.1 with such small field values, independently of the form of the potential, and that the recent claim to the contrary is based on an invalid approximation. We conclude that the result of the BICEP2 measurement of r>0.1, if confirmed, truly has the potential to rule out small-field models of single-field slow-roll inflation.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Theoretische Physik (Antusch)
UniBasel Contributors:Antusch, Stefan and Nolde, David Maik
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:IOP Publishing
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:30 Jun 2016 11:00
Deposited On:02 May 2016 09:21

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